题目内容
10.Heis sitting (sit) on the grass now.分析 他现在正坐在草地上.
解答 答案:is sitting.考查现在进行时.根据"now",现在,结合句意可知,说话时他应该正在坐在草地上.用现在进行时,即am/is/are+doing.主语为he,用is.sit的现在分词为sitting.
点评 考查时态的题,可根据题干中的时间和句意确定时态.

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